I just casted on for Berroco's March Basic Cardi and Im having trouble understanding Row 2 ( ). Please help

Row 1 (RS): K1, * p1, k1 rep from * across.

Row 2: P1, * k1, p1, rep from * across. Rep these 2 rows until piece measures 1 from beg, end on WS, dec 10 sts evenly spaced across  83(89-99-109-119-129) sts. Change to larger needles and work even in St st until piece measures 2 1/2 from beg, end on WS.

Dec Row (RS): K16(18-20-23-25-28), SSK, k47(49-55-59-65-69), k2 tog, k16(18-20-23-25-28)  81(87-97-107-117-127) sts. Continue in this manner to dec 1 st 16(18-20-23-25-28) sts in from each edge every 1 twice more, then every 3/4 4 times  69(75-85-95-105-115) sts. Work even until piece measures 9 from beg, end on WS. Inc 1 st each end of next row  71(77-87-97-107-117) sts. Rep this inc every 3/4 4 times more, then every 1/2 twice. Work even on 83(89-99-109-119-129) sts until piece measures 13 1/2 from beg, end on WS.

Now what Im not understanding is, do I do the decrease after I've repeated for 1"? Or do I do it the first time I knit row 2 then continue for 1" just ribbing? AAhhhhh

Row 2: P1, * k1, p1, rep from * across. Rep these 2 rows until piece measures 1 from beg, end on WS, dec 10 sts evenly spaced across  83(89-99-109-119-129) sts. Change to larger needles and work even in St st until piece measures 2 1/2 from beg, end on WS.

Dec Row (RS): K16(18-20-23-25-2Cool, SSK, k47(49-55-59-65-69), k2 tog, k16(18-20-23-25-2Cool  81(87-97-107-117-127) sts. Continue in this manner to dec 1 st 16(18-20-23-25-2Cool sts in from each edge every 1 twice more, then every 3/4 4 times  69(75-85-95-105-115) sts. Work even until piece measures 9 from beg, end on WS. Inc 1 st each end of next row  71(77-87-97-107-117) sts. Rep this inc every 3/4 4 times more, then every 1/2 twice. Work even on 83(89-99-109-119-129) sts until piece measures 13 1/2 from beg, end on WS.

You do the ribbing, decrease 10 stitches on one row and work in stockinette stitch until the whole thing measures 2 1/2 inches. That part is done.

Now you'll work the Dec Row on the next row, and an inch after that, an inch after that, etc.